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5w20 vs 5w30? #4812616
07/12/18 06:57 PM
07/12/18 06:57 PM
Joined: Apr 2009
Posts: 397
Southern VA
klt1986 Offline OP
klt1986  Offline OP
Joined: Apr 2009
Posts: 397
Southern VA
Would a 5w20 and 5w30, such as Mobil 1, Pennzoil Platinum, Valvoline Synthetic or Castrol Edge, have the same cold startup viscosity? I understand once the oil is at operating temperature, one should act as a 30 weight and the other as a 2o weight. However, wouldn't they both flow the same at startup??


Wife: 08 Honda CR-V 4WD, M1 5W-20
Me: 11 Toyota Tundra DC 4WD 5.7L, PP 5W-30
Me Work: 06 Ford Explorer 4WD 4.0L, Pennzoil 5W-30
Son: 14 Toyota Corolla S, M1 AFE 0W-20
Re: 5w20 vs 5w30? [Re: klt1986] #4812633
07/12/18 07:16 PM
07/12/18 07:16 PM
Joined: Mar 2016
Posts: 1,623
Western S.C.
CR94 Offline
CR94  Offline
Joined: Mar 2016
Posts: 1,623
Western S.C.
About.

Doesn't 5W-30 effectively consist of 5W-20 with a dash of extra VI improver thrown in?


2011 Toyota Prius now at 94K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: 5w20 vs 5w30? [Re: klt1986] #4812662
07/12/18 07:34 PM
07/12/18 07:34 PM
Joined: Jul 2015
Posts: 523
Pennsylvania
Astro_Guy Offline
Astro_Guy  Offline
Joined: Jul 2015
Posts: 523
Pennsylvania
They would if you were in Fairbanks Alaska in January. The 5w30 should be a little thicker in Virginia.

Re: 5w20 vs 5w30? [Re: klt1986] #4812679
07/12/18 07:42 PM
07/12/18 07:42 PM
Joined: Oct 2005
Posts: 11,408
PA
d00df00d Offline
d00df00d  Offline
Joined: Oct 2005
Posts: 11,408
PA
Originally Posted By: klt1986
Would a 5w20 and 5w30, such as Mobil 1, Pennzoil Platinum, Valvoline Synthetic or Castrol Edge, have the same cold startup viscosity? I understand once the oil is at operating temperature, one should act as a 30 weight and the other as a 2o weight. However, wouldn't they both flow the same at startup??

In sub-freezing temps, they'll be comparably pumpable.

On startup at more moderate temps, most 5W-20s will be thinner than most 5W-30s.


2008 BMW M3
Re: 5w20 vs 5w30? [Re: klt1986] #4812720
07/12/18 08:09 PM
07/12/18 08:09 PM
Joined: Mar 2015
Posts: 5,393
Virginia
bbhero Offline
bbhero  Offline
Joined: Mar 2015
Posts: 5,393
Virginia
Yep. The same. The last couple of winter's with low temps down to as low as -7F in the area... No difference amongst those oils at start up. If it pumps.... It pumps. Which those oil would. If those oils fall back into the sump... It falls back into it. Which those iils would have easily at -5 to -7F. The CCS and MRV with all these oils make them all great for the coldest temps seen in this area. I would not be concerned at all smile

Last edited by bbhero; 07/12/18 08:10 PM.

Nissan Altima 3.5 Coupe
Mobil Super 5w30 Wix 57356
"Treat your family like your friends and treat your friends like your family."
Re: 5w20 vs 5w30? [Re: klt1986] #4812749
07/12/18 08:46 PM
07/12/18 08:46 PM
Joined: Mar 2008
Posts: 5,960
South Florida
bubbatime Offline
bubbatime  Offline
Joined: Mar 2008
Posts: 5,960
South Florida
Not the same, but close. Every oil will have its own viscosity, at each temp, measured in centistokes.

So when you say startup, what temp are you talking about? Because in Alaska, the cold start winter viscosity is going to be drastically different than the cold start viscosity in Phoenix in the summer.

One paper I read showed when oil is freezing solid, right below its pour point, it has about 100,000 centistokes. This is about -45 degrees C. At operating temp, 100 degrees C, a synthetic 5W20 has about 9 centistokes.

So a synthetic 5W20 has between 9 centistokes at operating temp, and 100,000 centistokes when the oil is frozen solid and almost pours.

The 5W30 vs 5W20 labeling is a layman's labeling system, to dumb down what the oil does for the average consumer. Most folks wouldn't understand what viscosity oil to buy if it was labeled by centistokes.


17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
10 Acura TSX 2.4 Maxlife Syn 5W30
06 GMC Sierra Nextgen 10W30



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